Radiating casing for electrical apparatus



M. L. ELDER RADIATING CASING FOR ELECTRICAL APPARATUS Filed July 16, 1920 Inventor: Matthew L..E|der,

by M q M His Attorney.

l atented @ct. 23, W23.

entree stares tenets PATENT: creates.

MATTHEW L. ELDER, F PITTSFIELD, MASSACHUSETTS, ASQIGNOR TC GJENAL ELEC- ERIC COMPANY, A CORPORATION 015 NEW YCRK.

RADIATINQ CASING FDR ELECTRICAL AIPPTUE.

Application filed July 16, 1920. serial It'o. $96,824.

To all whom it may concern Be it known that ll, MATTHEW L. Ennnn, a citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Radiating Casings for Electrical Apparatus, of which the following is a specification.

My invention relates to sheet metal radlating casings for electrical apparatus, and has for its object an improved arrangement of parts which will afiord substantial] a maximum radiatin surface and whic is economical and rea%ily manufactured.

In electrical apparatus submerged in insulating fluid such as oil, for instance in transformers, some reactors and the like, it has become the practice to construct the containing casing for the apparatus with its insulating flu1d as a radiator in order that it may radiate readily the heat generated therein by the operation of the electrlcal a paratus. This was in general accomplished by increasing the exposed surface of the casing as by corrugating 1ts walls. A. particularly advantageous arrangementof these corrugations is shown in the pr1or U. S. Patent No. 713,901 to Moody where the external grooves in the corrugations are made wider than the internal grooves. Such construction, as is here shown, was not infrequently partly cast and partly welded.

An all welded construction, however, possesses many obvious advantages over the present state of the art; accordingly some casings are now made b assembling a plurality of corrugated units, single U-shaped units being used in certain instances. The use of single U-shaped units requires a great amount of line welding and does not lend itself to the most economical use of the stock employed and is hence relatively expensive. Casings of difierent sizes and dia eters may be formed by assembling diilerent numbers of units such as this invention pr vides, so that by using only a small number of units differing only in length and in the depths of the corrugations, a great many difi'erent sizes and shapes ofcasings may be formed.

In carrying my invention in to efiect, ll not only take advantage of having a unit from which casings of various sizes and shapes may be formed, but also so shape the the unit asto get the greatest economy in the sheet stock material employed and to reduce the number of welds to the minimum compatible with the use of a unit from which to assemble a variety of diderent casings.

For a more complete understanding of the nature and objects of my invention, reference should be had to the following detailed description, taken in connection with the accompanying drawing in which:

Fig. 1 is a fragmentary perspective view of the type of unit employed by my invention; Figs. 2 and 3 are a plan view and a side elevation respectively of casings in the form of radiators, constructed from units of my invention; and Fig. 4 is a view partly in sectlon and partly in elevation of a tank or casing made from units of my invention.

Referring now to the drawing and to F1g. 1 in particular, 10 represents one end of a unit of my invention which may be said to be W-shaped in cross-section and which is arranged to have closed ends. This unit has two channels 11 and 12 and a crest 13 between side walls 14. Thesewalls each terminate in a longitudinal welding edge 15. The channels on the outside are preferably made wider than those at the inside, as indicated.

To close the ends of the W-shaped unit so formed, I preferably pinch them together as shown 1n Fig. 1, and at the same time draw out the bottom ot the channels 11 and 12 where the ends are pinched together so as to tilt make two flush fiat backs 16 and 17. These backs may have any desired longitudinal depth (depending on how much of the units ends are pinched together), but a depth substantially the same as the rim on which the units are welded is preferable for reasons hereinafter more fully inted out. The W-shaped unit 10 where pinched ends are employed may have the central pinched crest 18 welded preparatory to assembly, or the whole welding operation involved in making the casing may be left to be completed at substantially the same time.

The corrugations in the unit 10 are readil formed with the aid of dies and are pre erably of such a depth that the whole width of the sheet of stock from which they are struck is utilized without waste.

Units such as I have described may be assembled to form radiators for attachment to plain casings, as shown in Figs. 2 and 3. In

llCfl these radiators rectangular top and bottom plates 20, whose outer edges have been upset as shown at 21 in order to provide a better welding surface, form the ends for these radiators. A.v plurality of W-shaped units are placed side by side to form the front and back walls of the radiators, three units 10*, 10", 10 being emploged on a side in the instance illustrated. lain sheets 22 form the side walls of the radiators, which sheets are of sufiicient width to meet the welding edges of the end units 10 and 10 as indicated at 22 and 22, the other longitudinal edges of these unitsbeing welded at e and tively. The flat backs of the pine led ends are disposed against the-upset edges 21 and are welded thereto.

Radiators thus formed may be attached to their casing in any desired manner; elbows 25, having central connections to the top and bottom plates 20 as shown, are suitable for this purpose.

When it is desired to form a casing proper of my units, care must be taken to see that the periphery of the proposed casing is commensurate with the width of the unit. Top and bottom members for the tank or casing of proper dimensions having been selected, the W-shaped units are arranged side by side with the flat drawn out pinched ends resting on the top and bottom members. In Fig.

4., the top member is a top-ring while the bottom member 31 is shown as the base for the tank shown.

The units 10 are welded along their longitudinal edges and across their pinched ends to'the members 30 and 31. The depth of the pinched ends is here such as to avoid the formation of pockets.. .3a bove or below the edges of members 30 and 31. i

A tank thus formed has all the advantages of unit construction with relatively little welding since the longitudinal Welding edges occur only at the crests of alternate corrugations.

Having now described an embodiment of my invention which is at present-the best means known to me for carrying the same into effect, I would have it understood that this is merely illustrative and that I do not mean to be limited thereby to the precise details shown, nor restricted in the choiceof recognized equivalents except as defined in my claims hereunto annexed.

respec- What I claim as new and desire to secure by Letters Patent of the United States, is 1. A unit adapted for the construction of sheet metal radiating casings, said unit having a cross-section which is substantially W-shaped, and having, its ends closed by a welded portion, the ottoms of'the channels at the ends between the corrugations be-.

ing drawn out to form fiat backs.

.2. A unit adapted for the construction of sheet metal radiating casings, said unit having a cross-section which is substantially W-shaped, and having its ends closed by pinching together the corrugations, the bottoms of the pinched channels between the corrugations being drawn out to form fiattogether along longitudinal edges to complete a radiating caslng.

5. The combination with top and bottom casing members having welding edges, of a plurality of W-shaped corrugated units having pinched ends with flat backs secured to "said welding edges, said units being welded together along longitudinal edges to complete a radiating casing.

6. The combination with top and bottom casing members having upturned welding edges, out a plurality of W-shaped corrugated units having pinched ends with thebottoms of the channels drawn out to form fiat backs of the same depth as the width of the welding edges on said members said units being welded to said members, and

.welded to each otheralong longitudinal meetingedges to complete a radiating casing.

In witness whereof, I have hereunto set my hand this 13th day of July, 1920.

- MATTHEW L. ELDER. 

